Question

我正在使用Parse和。在IO中创建一个应用程序想知道我怎么能确定我得到的文件是视频还是图像的任何想法？有什么建议吗？

Answer 1

这是我到目前为止所做的事情

      if let value = allPost[indexPath.row]["imageFile"] as? PFFile {

        let PFFileURLFromParse = value.url

        let fileUrl = NSURL(string: PFFileURLFromParse!)

      func thumbnailImagePreview() -> UIImage?

        {

            let asset = AVURLAsset(URL: fileUrl!)

            let imageGenerator = AVAssetImageGenerator(asset: asset)

            imageGenerator.appliesPreferredTrackTransform = true

            imageGenerator.apertureMode = AVAssetImageGeneratorApertureModeEncodedPixels

            do {

                let time: CMTime = CMTime(seconds: 0.0, preferredTimescale:1)

                let imageRef = try imageGenerator.copyCGImageAtTime(time, actualTime: nil)

                return UIImage(CGImage: imageRef)

            } catch {

                return nil

            }

        }

       if (fileUrl!.pathExtension!.lowercaseString == "mov"){

            print("Parse image is a mov: \(fileUrl!.pathExtension!.lowercaseString)”);

fileExtenion = "mov";

cell.ImagePost.image = thumbnailImagePreview()

            cell.ImagePost.loadInBackground()

            print("fileExtenion is \(fileExtenion)")

         }

        else{

            fileExtenion = ".png";

            print("DEFAULTING TO file type, Parse image is a png: \(fileUrl!.pathExtension!.lowercaseString)");

        }

        cell.ImagePost.file = value

        cell.ImagePost.loadInBackground()

    }

//但是单元格的加载时间过长我怎么把它放在collectionView（collectionView：UICollectionView，cellForItemAtIndexPath indexPath：NSIndexPath） - ＆gt; UICollectionViewCell {}

如何确定PFFile是视频还是图像？

1 个答案: